640012739364 has 30 divisors (see below), whose sum is σ = 1673119723814. Its totient is φ = 213337579680.

The previous prime is 640012739363. The next prime is 640012739393. The reversal of 640012739364 is 463937210046.

It can be written as a sum of positive squares in only one way, i.e., 437820422400 + 202192316964 = 661680^2 + 449658^2 .

It is a super-2 number, since 2×640012739364² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640012739363) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 987673657 + ... + 987674304.

Almost surely, 2^640012739364 is an apocalyptic number.

It is an amenable number.

640012739364 is an abundant number, since it is smaller than the sum of its proper divisors (1033106984450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640012739364 is a wasteful number, since it uses less digits than its factorization.

640012739364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975347977 (or 1975347966 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The spelling of 640012739364 in words is "six hundred forty billion, twelve million, seven hundred thirty-nine thousand, three hundred sixty-four".